GB2590379A

GB2590379A - Method and system for providing public announcements

Info

Publication number: GB2590379A
Application number: GB1918342.5A
Authority: GB
Inventors: Sali Hemant
Original assignee: Bombardier Transportation GmbH
Current assignee: Alstom Transportation Germany GmbH
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2021-06-30
Also published as: GB201918342D0; WO2021116173A1; EP4074084A1

Abstract

A method for providing public announcements in a vehicle for public passenger transport, for example in a respective railway vehicle 101, includes connecting a mobile device 1, to a server 4 of the vehicle 101, using the connected mobile device 1, to transfer a spoken message as VoIP message (VM) to the server 4, transmitting the VoIP message (VM) from the server 4 to an audio system 5 of the vehicle 101, and using the audio system 5 to convert the VoIP message (VM) into an analogue audio signal (AM).

Description

METHOD AND SYSTEM FOR PROVIDING PUBLIC ANNOUNCEMENTS Technical field 100011 The present invention relates to methods and systems for providing public announcements in a vehicle for public passenger transport, for example a respective railway vehicle.

Background

100021 Many vehicles for public passenger transport are equipped with an announcement system for providing live messages such as such as safety announcements, status announcements, and connecting travel announcements to the passengers by a driver or another crew member such as a steward or a conductor. For example, analog lines may be used for making public announcements by a crew member from fixed locations in the vehicle.

100031 Further, document US 0 171 556 B2 describes systems and methods for transferring a public announcement message to an onboard public announcement system (OPAS) installed on a vehicle using a personal electronic device. The personal electronic device establishes a wireless network connection to the OPAS to transmit a public announcement message stored on a personal electronic device. The personal electronic device transmits the public announcement message to the OPAS via the wireless network connection. The personal electronic device may download messages from a remote public announcement server for transfer to the OPAS. The personal electronic device may also record messages and control the playback of messages on the OPAS.

100041 Furthermore, document EP 2 874 860 B1 describes an operating system for operating functional units in a rail vehicle. At least one base station is provided in each car of the rail vehicle. Each base station communicates, via a wireless interface, with a mobile terminal of an authenticated user, in particular an authenticated train conductor, who operates functional units of the rail vehicle via a graphical user interface of the mobile terminal. The train conductor has the option of making announcements. Audible announcements may be stored in advance and be activated by the train conductor by operating an appropriate sensitive area of the graphical interface.

100051 The existing solutions for public announcements may be not user-friendly enough, have a comparatively large overhead for recording, storing, transferring, and/or playing the announcements, and/or can only be made from specific static locations in the vehicle.

Problem to be solved 100061 It is an object of the invention to provide methods, systems and devices allowing for improved performance and/or efficiency of public announcement systems, in particular with respect to providing live messages and/or in terms of time. Thus, user satisfaction may be enhanced.

100071 Said task is solved by the subject matter of the independent claims.

100081 According to an embodiment of a method for providing public announcements in a vehicle for public passenger transport, for example in a respective railway vehicle, the method includes connecting a mobile device to a server of the vehicle, using the connected mobile device to transfer a spoken message as VoIP message (Voice over IP message) to the server, transmitting the VoIP message from the server to an audio system of the vehicle, and using the audio system to convert the VoIP message into an analog audio signal.

100091 The spoken message is typically not pre-recorded (prior to connecting the mobile device to the server), i.e. a live message.

100101 By using a mobile device, a crew member, in particular a conductor may make live announcements from different places in the train.

100111 Further, at least the performance of public announcements in public transport vehicle may be improved due to using VoIP technology.

100121 The mobile device may be a smart phone or a tablet computer.

100131 Further, the mobile device typically includes a storage storing a web application or a mobile application which may be used for establishing a data connection to the server, and the method may comprise connecting to the server, recording the spoken (live) message, converting the spoken message into VoIP (VoIP message), converting the spoken message on the fly into VoIP (VoIP message) and/or transferring the message converted into VoIP (herein referred to as VoIP message) to the server when running on the mobile device.

100141 The term pp as used herein shall embrace the terms "web application" and "mobile application" 100151 The term server as used herein shall refer both to a computer program (software) and a device providing functionality for other programs or devices, typically called "clients", for example to a respective device including the software for providing server functionality (for clients) in a network, for example a network using the internet protocol suite, Transmission Control Protocol / Internet Protocol (TCP/IP) and/or User Datagram Protocol / Internet Protocol (UDP/IP). In the following a device providing server functionality in a network is also referred to as "host".

100161 The mobile device may be wirelessly connected to a wireless interface of the vehicle which is connected to the VolP server, a wireless router of the vehicle which is connected to the VoTP server, or any other device of the vehicle connected to the VoTP server and providing a wireless interface for communication with the mobile device. In other words, the mobile device may be (wirelessly) connected to a Wi-Fi network of the vehicle (which is different from the local area network of the vehicle).

100171 Accordingly, connecting the mobile device to the server typically includes connecting the mobile device to and/or via the wireless interface or the wireless router of the vehicle, and/or to the other device providing the wireless interface.

100181 Further, connecting the mobile device to the server may include logging in on the server, e.g. using a username and a password that may be provided by or via the app.

100191 Accordingly, it may not be required to register the mobile device on a fixed terminal within the vehicle However, the mobile device is typically pre-registered as crew-member device.

10020] The wireless interface may include a (wireless) router and one or more wireless access points.

100211 The server, the audio system, and the wireless interface (in particular the wireless access point(s) and/or the wireless router) are typically connected with each other via a local area network of the vehicle, for example a local area network that is a wired data network and/or uses the Internet Protocol and/or Ethernet technology.

100221 For example, the local area network may use coaxial cable, twisted pair links and/or fiber optic links in conjunction with switches as a shared medium for information transfer.

100231 Using the connected mobile device to transfer the spoken message may include recording the spoken message and converting the spoken message into the VoIP message after connecting the mobile device, sending the VoIP message to the server, receiving the VoTP message at the server, and/or recording the VoLP message by the server.

100241 The spoken message may be converted into the VoIP message during recording (on the fly) 100251 Further, the recorded message may be deleted and/or not archived on the mobile device after converting the spoken message into the VoIP message.

100261 Accordingly, overhead and storage requirements may be reduced.

100271 The method may further include: -transmitting a first code from the mobile device to the server to indicate that the spoken message is to be transferred, -awaiting an input of a user prior to initiating the transmitting of the first code, transmitting a second code from the server to the mobile device to initiate at least one of sending the VoIP message to the server and recording the VoLP message by the sewer, -receiving the second code at the mobile device, -transmitting a third code from the mobile device to the server to indicate an end of sending the VoIP message to the server, stopping the recording of the VoIP message by the sewer after receiving the third code or after a predefined duration of silence (timeout without receiving further VoIP-packages from the mobile device), and/or sending an acknowledgement message from the Von) server to the mobile device.

100281 Accordingly, communicating and/or transferring the VoIP message to the server may be facilitated.

100291 The VoIP server typically supports different languages, and is typically configured for a specific language in these embodiments, for example a preselected language such as English. This helps the sewer broadcast the audio message such as 'Please start recording the message and press # to end the message' in the configured language to the mobile device 100301 Further, the mobile device typically sends the language code to the Server in the first code/message in these embodiments.

[0031] The VoIP message is typically transmitted from the mobile device to the server using a real time transmission protocol (RIP), in particular a secure real time transmission protocol (SRTP) for safety reasons.

100321 Further, the VoIP message is typically transmitted from the sewer to the audio system using the session initiation protocol (SIP, for example RFC 3261).

100331 More typically, the respective VoIP-functionality is implemented via SIP and RTP, for example using SIP and SRTP.

100341 Accordingly, the sewer typically provides at least one of SIP-sewer functionality and VoIP-server functionality.

100351 After converting the VoIP message into an analog audio signal by the audio system, the analog audio signal is typically broadcast.

100361 This may include transmitting the analog audio signal to one or more loudspeakers of the audio system and/or one or more analog audio connectors of the audio system.

100371 Note that the VoIP message may also be transferred from a controller of the audio system to a loudspeaker or loudspeakers of the audio system, wherein the loudspeaker(s) is(are) configured to convert the VoIP message (VNI) into a respective analog audio signal, these loudspeakers supporting VoIP and hosting a respective SIP agent.

100381 In other words, the method for providing public announcements may include connecting a mobile device to a sewer of the vehicle, using the connected mobile device to transfer a spoken message as VoIP message to the server, transmitting the VoIP message from the server to an audio system of the vehicle, and using the audio system to emit the VoIP message as audible (analog) signal in the vehicle. This may include converting the Von' message into an analog signal, transmitting the analog signal and emitting the analog signal in that order and/or transmitting the VoIP message, converting the Vol? message into an analog signal and emitting the analog signal in that order.

100391 Typically, the Vali message is only transmitted from the server to the audio system after completely receiving the VoIP message from the mobile device, more typically with a delay.

100401 The delay between completely receiving the VoIP message at the server and transmitting the VolP message is typically equal to or larger than a predefined first value and/or equal to less than a predefined second value.

100411 In particular, the delay may be at least about 0.25 s or 0.5 s (predefined first value).

100421 Further, the delay may be smaller than or equal to about 5 s, more typically 2 s or even 1 s (predefined second value) to avoid unwanted long delay times in emergencies.

100431 The quality of the public announcement may be significantly improved, in particular when the live message is recorded with the mobile device next to loudspeaker of the audio system (since unwanted feedback can be avoided) Further, the performance in terms of time may be improved significantly due to the usage of VoIP technology.

100441 In other words, the server typically provides VoIP-server functionality with delayed paging 100451 According to an embodiment of a system for providing public announcements, the system includes a wireless interface provided by a vehicle for public passenger transport and connected to a local area network of the vehicle, a server provided by the vehicle and connectable to the local area network, a mobile device (wirelessly) connectable to the server via the wireless interface and the local area network, the mobile device being configured to send, in a connected state, a spoken message as Volt) message to the server, and an audio system provided by the vehicle, connectable with the server via the local area network, and configured to receive, in a connected state, the VoIP message from the server and to convert the received VoIP message into an analog audio signal.

100461 Typically, the system is configured to perform the methods as explained herein.

100471 As already explained above, the mobile device may be a smartphone, a tablet computer or the like.

100481 Further, the mobile device may include an app which is, when running on the mobile device, configured to establish a data connection to the server, send the spoken message as VoIP message to the server and the other functions explained above.

100491 The local area network is typically a wired data network and/or uses the Internet Protocol and/or Ethernet technology.

100501 Further, the server, the mobile device, the app, and/or the audio system, typically any of the said devices, is configured to use a session initiation protocol (SIP) and a real time transmission protocol (RIP), for example a secure real time transmission protocol (SRTP).

[0051] The server is typically operable as a VoIP-server, and the mobile device, the app and the audio system are typically operable as an SIP-agent.

100521 The sewer may for example be provided by one or more computer devices of a passenger comfort system of the vehicle, the computer devices(s) hosting the VoIP sewer typically bridging the Wi-Fi network of the vehicle and the local area network of the vehicle.

100531 In case the existing computing devices of the passenger comfort system do not allow for hosting the VoIP sewer due to technical reasons, a new computing device may be added to the comfort system to host the Von' sewer.

100541 Further, the sewer is typically configured to transmit the VoIP message to the audio system after completely receiving the VoIP message from the mobile device, typically with a delay which may be equal to or larger than a predefined first value of for example about 0.2 s or 0.5 s and/or equal to or less than a predefined second value of for example about 5 s, 2 s or 1 s.

100551 Further, the system typically includes a railway vehicle as the vehicle 100561 According to an embodiment of a vehicle for public passenger transport, for example a respective railway vehicle, the vehicle includes a local area network, a device connected to the local area network and providing a wireless interface, such as a wireless router optionally connected with wireless access point, a server connected to the local area network, and an audio system connected with the server via the local area network, the audio system configured to receive a VolP message from the server and to convert the VolP message into an analog audio signal, for example a server as explained herein and an audio system as explained herein.

100571 A mobile device, for example a mobile device as explained herein may be connectable to the server via the wireless interface provided by the vehicle and connected with the local area network, wherein the mobile device is configured to send in a connected state a spoken message as a VolP message to the server.

100581 Other embodiments include one or more computer-readable storage media, and one or more computer programs recorded on the one or more computer-readable storage media or computer storage devices, and configured to perform the processes of the methods described herein 100591 In particular, a computer program and/or a computer-readable storage medium may include instructions which, when executed by one or more computing units (processors) of a system, in particular a public announcement system disposed in a public transport vehicle, cause the system to carry out the processes of the methods explained herein.

100601 The above-described embodiments can be combined with each other in any way if not specified otherwise. Those skilled in the art will recognize additional features and advantages upon reading the following detailed description, and upon viewing the accompanying drawings.

Brief description of the figures

100611 The attached drawings illustrate embodiments and together with the description serve to explain the principles of the invention. The elements of the drawings are shown relative to each other and are not necessarily to scale.

100621 The same reference numbers denote similar or even equal components.

100631 FIG. IA is a block diagram schematically illustrating a system providing public announcements according to embodiments 100641 FIG. 1B is a block diagram schematically illustrating a system providing public announcements according to embodiments.

100651 FIG. 2A is a block diagram schematically illustrating a system providing public announcements according to embodiments 100661 FIG. 2B illustrates a flow chart of a method for providing public announcements according to embodiments.

100671 FIG. 2C illustrates a flow chart of a method for providing public announcements according to embodiments.

Detailed description

100681 FIG. lA is a block diagram schematically illustrating a system 100 for providing public announcements 100691 In the exemplary embodiment, system 100 includes a wireless interface 23, a server 4 and an audio system 5 arranged in a passenger train 101. As indicated by the dashed-dotted arrows in Fig. 1A, a wireless interface 23 for providing a Wi-Fi network of a train, a server 4 and an audio system 5 are connected with each other via a local area network of the train.

100701 A mobile device 1, in particular a mobile device of a conductor or another crew member is configured to send a spoken message as VolP message VN4 to the server 4 when connected to the server 4 via the wireless interface 23 and the local area network.

100711 For example, the (pre-registered) mobile device 1 of the conductor may wirelessly connect with the trains network which is provided by mobile accessible router (MAR) and access points such as WLAN-access points of train 100.

100721 The audio system 5 may be configured to receive via the local area network the VoTP message VM from the sewer 4, to convert the received VolP message into an analog audio signal AM and to broadcast the analogue audio message AM via a loudspeaker 6 provided by and/or connected with audio system 5.

100731 Typically, audio system 5 hosts an SIP agent for this purpose (public announcements).

100741 Likewise, mobile device I typically also hosts a respective SIP agent, for example as a part of an app, in particular a mobile app running on mobile device 1.

100751 In addition, audio system 5 may host an SIP agent and may convert a VoIP message into an analog audio signal.

100761 The VoIP server 4 is typically configured to use paging for the public address via mobile device 1 and dial in the SIP agent for public address on the audio system 5 100771 For making a public announcement, the conductor may first dial in a special code using the app 100781 Thereafter, the conductor may hear an automatic message played by the app which requests the conductor to speak the (live) message and press a special key such as the Hash key to signal the end of the message.

100791 While the conductor speaks into the mobile device 1, the mobile device 1 converts to and transmits the converted spoken message as a VoIP message to server 4 until the special key is pressed or a predefined timeout time is exceeded.

100801 After recording the VoIP message, the server 4 may dial in the SIP agent on (of) the audio system 5.

100811 Note that the SIP agent on the audio system 5 typically auto attends to incoming calls for public address (public announcements) 100821 Thereafter the server 4 may transfer the recorded VoIP message to the public address SIP agent of the audio system 5 using an RTP protocol, in particular an SRTP protocol.

100831 The public address SIP agent on the audio system 5 may, typically as per an audio system configuration either make an announcement to the loud speaker 6 of the audio system 5 if the loud speaker 6 hosts a separate sip agent converting the VoIP message in an analogue audio signal, or convert the VoIP message into an analog audio signal and make the announcement to the (analog) loud speaker 6.

100841 As illustrated in Fig 1A, the audio system typically includes an audio control device 5 and at least one loudspeaker 6 connected with the control device 5.

100851 In other embodiments, the audio system includes or consists of at least one loudspeaker 6 hosting an sip agent. In these embodiments, the VoIP server 4 may directly transmit the VolP message to the at least one loudspeaker 6 100861 FIG. 1B is a block diagram schematically illustrating a system 200 for providing public announcements. The system 200 is similar to the system 100 explained above with regard to figure IA. However, audio control device 5 of system 200 is connected with two exemplary loudspeakers 6, 7, for example a cab loudspeaker 6 and a saloon loudspeaker 7.

100871 Typically, the audio control device 5 is connected with the plurality of loudspeakers 6, 7.

100881 Further, it is illustrated in figure 1B that the wireless interface 23 of train 201 typically consists of a router 3 and at least one wireless access point 2 100891 As further illustrated in figure 2A illustrating a system 300 for providing public announcements, a plurality of wireless access points may be distributed within the train 301, in this example two wireless access points 2, 2'.

100901 Accordingly, the mobile device 1 of a conductor may have access to the local area network of train 301 from at least almost any point within the train 301.

100911 Further, another crew member may use a further mobile device l' to make live announcements via the sewer 4 as indicated by the VoLP message VA/I' in figure 2A.

100921 FIG. 2B illustrates a flow chart of a method 1000 for providing public announcements in a vehicle, in particular a train.

100931 In a block 1100, a typically pre-registered mobile device in particular a mobile device of a crew member is connected to a VolP server of the vehicle.

100941 In a subsequent block 1200, a message spoken into the mobile device is transferred to the server as VoTP message 100951 In a subsequent block 1300, the server transmits the recorded and stored message (as a Vol? message) to an audio system of the vehicle. This is typically done after completely receiving the VolP message at the server, more typically after further expiry of a predefined time delay.

100961 Thereafter, the audio system is used to broadcast the VoIP message via loudspeakers to the passengers of the vehicle in a block 1400.

100971 Typically, the blocks 1100 to 1200 are performed using an app running on the mobile device.

100981 As illustrated in FIG. 2C showing a flow chart of a method 1200' that may be used as block 1200 in figure 2B, using the connected mobile device to transfer the spoken message to the VolP server of the vehicle may include or consist of the following processes.

100991 In a block 1210, a first (predefined) code may be transferred from the mobile device to the server to indicate that the spoken message is to be transferred.

1001001 Thereafter, the mobile device may wait for a response from the server in a block 1220. For example, the server may send a second (predefined) code to the mobile device to indicate that the mobile device can start sending the message as voice over IP message which is typically recorded by the server.

1001011 After receiving the second code, the app ninning on the mobile device may indicate that the live message can now be spoken into the mobile device.

1001021 After finishing speaking, the user may press a button displayed by the app on the mobile device's display to indicate the end of the message to be transferred.

1001031 If the button is pressed or a predefined timeout of silence has expired, the mobile device may send a third code to the server to indicate the end of message transfer in a block 1230 1001041 After receiving the third code, the server typically stops recording in a block 1240.

1001051 Thereafter, the VolP server may send an acknowledgement message to the mobile device in a block 1250 1001061 Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. This application is intended to cover any adaptations or variations of the specific embodiments discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equivalents thereof List of reference numbers 1, l' mobile device 2, 2' wireless access point 3 (wireless) router 23 wireless interface 4 host / server audio system 6, 7 loudspeaker 100, 200, 300 system 101, 201, 301 vehicle, train 1000-1500 method steps AM analog audio signal VM, VA4' Voice over IP message! VolP message

Claims

Claims 1 A method (1000) for providing public announcements in a vehicle for public passenger transport, for example in a respective railway vehicle (101, 201, 301), the method comprising: connecting (1100) a mobile device (1, 1') to a sewer (4) of the vehicle (101, 201, 301); using (1200, 1200') the connected mobile device (1, 1') to transfer a spoken message as a VoLP message (VM) to the sewer (4); transmitting (1300) the VoLP message (VNI) from the server (4) to an audio system (5) of the vehicle (101, 201, 301); and using (1400) the audio system (5) to convert the Vol? message (VM) into an analog audio signal (AM).
2 The method of claim 1, wherein connecting (1100) the mobile device (1, 1') to the sewer (4) comprises wirelessly connecting the mobile device to and/or via a wireless access point (2) of the vehicle (101, 201, 301) and/or a wireless router (3) of the vehicle (101, 201, 301), the wireless access point (2) and/or the wireless router (3) being connected to the VoLP sewer (4).
3 The method of any preceding claim, wherein the server (4) and the audio system (5) are connected with each other via a local area network of the vehicle (101, 201, 301), wherein the server (4) is connected with the wireless access point (2) and/or the wireless router (3) via the local area network, and/or wherein the local area network is a wired data network and/or uses the Internet Protocol and/or Ethernet technology.
4. The method of any preceding claim, wherein using (1200) the connected mobile device (1, 1') to transfer the spoken message comprises at least one of: recording the spoken message and converting the spoken message into the VoIP message (VM) by the mobile device (1, 1') after connecting (1100) the mobile device (1, 1'); sending the VoIP message (VM) to the server (4), receiving the Vol? message (VM) at the server (4), and recording the Vali message (VM) by the server (4) The method of claim 4, wherein the spoken message is converted into the Vol? message (VM) during recording, and/or wherein the recorded message is deleted and/or not archived on the mobile device (1, 1') after converting the spoken message into the VolP message (VM).6. The method of any preceding claim, further comprising at least one of: -transmitting (1210) a first code from the mobile device (1, 1') to the server (4) to indicate that the spoken message is to be transferred; -awaiting an input of a user prior to initiating the transmitting of the first code; transmitting a second code from the server (4) to the mobile device (1, 1') to initiate at least one of sending the Von' message (VM) to the sewer (4) and recording the VoIP message (VM) by the server (4), receiving (1220) the second code at the mobile device (1, 1'); transmitting (1230) a third code from the mobile device (1, 1') to the sewer (4) to indicate an end of sending the VoIP message (VNI) to the server (4); stopping (1240) the recording of the VoIP message (VM) by the server (4) after receiving the third code or after a predefined duration of silence; and sending (1250) an acknowledgement message from the VoIP server (4) to the mobile device (1, 1').7 The method of claim 6, wherein the first code includes a language code, and/or wherein the VoIP message (VM) is not stored on the mobile device (1, 1') after sending to the VolP sewer (4) and/or after receiving the acknowledgement message from the VoIP server (4).8. The method of any preceding claim, wherein the VoIP message (VM) is transmitted from the mobile device (1, 1') to the server (4) using a real time transmission protocol (RTP), for example a secure real time transmission protocol, wherein the VoIP message (VM) is transmitted from the server (4) to the audio system (5) using the session initiation protocol (SIP), and/or wherein the respect VoIP-functionality is implemented via SIP and RIP, 9. The method of any preceding claim, wherein the server (4) provides at least one of a SIP-server functionality and a VoIP-server functionality.10. The method of any preceding claim, further comprising: - transmitting the analog audio signal (AM) to at least one of o a loudspeaker (6, 7) of the audio system (5); o an analog audio connector of the audio system (5).11 The method of any preceding claim, wherein the VoIP message (VM) is transmitted from the server (4) to the audio system (5) after completely receiving the VoIP message (VIVI) from the mobile device (1, 1').12. The method of claim 11, wherein a delay between receiving the Vol? message (VM) and transmitting the VoIP message (VM) is larger than a predefined first value and/or less than a predefined second value.13. The method of any preceding claim, wherein an app running on the mobile device (1, 1') is used for at least one of: - establishing a data connecting to the server (4); and - transmitting the spoken message as VolIP message (VM) to the server (4).14 A system (100, 200, 300) for providing public announcements, the system comprising: a wireless interface (2, 23) provided by a vehicle (101, 201, 301) for public passenger transport, and connected to a local area network of the vehicle (101, 201, 301); a server (4) provided by the vehicle (101, 201, 301) and connectable to the local area network; a mobile device (1, 1') connectable to the sewer (4) via the wireless interface (2, 23) and the local area network, the mobile device (1, 1') being configured to send, in a connected state, a spoken message as VoIP message (VM) to the server (4), and an audio system (5) provided by the vehicle (101, 201, 301), connectable with the server (4) via the local area network, and configured to receive, in a connected state, the VoIP message (VM) from the server (4) and to convert the received VolP message into an analog audio signal (AM).15. The system of claim 14, wherein the system is configured to perform the method of any of the claims 1 to 13.16. The system of any of the claims 14 to 15, wherein the mobile device (1, 1') is a smartphone or a tablet computer, and/or wherein the mobile device (I, 1') comprises an app which is, when running on the mobile device (1, 1'), configured to: -establish a data connecting to the server (4); and send the spoken message as VoLP message (VM) to the sewer (4) 17. The system of any of the claims 14 to 16, wherein the local area network is a wired data network and/or uses the Internet Protocol and/or Ethernet technology.18. The system of any of the claims 14 to 17, wherein at least one of the server (4), the mobile device (1, 1'), the app, and the audio system (5) is configured to use a session initiation protocol (SIP) and a real time transmission protocol (RTP) 19. The system of claim 18, wherein the real time transmission protocol (RTP) is implemented as a secure real time transmission protocol (SRTP).20. The system of any of the claims 14 to 19, wherein the server (4) is operable as a VoIPsewer.2] The system of any of the claims 14 to 20, wherein at least one of the mobile device, the app, the audio system (5), a controller of the audio system (5), and a loudspeaker (6, 7) of the audio system (5) is operable as an SIP-agent.22. The system of any of the claims 14 to 20, wherein the server (4) is provided by one or more computer devices of a passenger comfort system of the vehicle (101, 201, 301), 23 The system of any of the claims 14 to 22, wherein the sewer (4) is supports different languages and/or is configured for a specific language, and/or wherein the server (4) is configured to transmit the VolP message (VM) to the audio system (5) after completely receiving the VoIP message (VM) from the mobile device (1, 1') with a delay.24. The system of claim 23, wherein the delay is larger than a predefined first value and/or less than a predefined second value.25. The system of any of the claims 14 to 24, wherein the vehicle (101, 201, 301) is a railway vehicle (101, 201, 301).